﻿

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace Utility
{


    public class DESEncryptExtension
    {
        private static string DESKey = $"{nameof(DESEncryptExtension)}1234567891011";

    
        public static string Encrypt(string Text)
            => Encrypt(Text, DESKey);


 
        public static string Decrypt(string Text)
        {
            if (!string.IsNullOrEmpty(Text))
                return Decrypt(Text, DESKey);
            else
                return "";
 
        }



        private static byte[] Keys = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F };
  

        public static string Encrypt(string encryptString, string encryptKey = null)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes((encryptKey?? DESKey)[0..16]);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                var DCSP = Aes.Create();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch (Exception ex)
            {
                return ex.Message + encryptString;
            }

        }
   

        public static string Decrypt(string decryptString, string decryptKey = null)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes((decryptKey ?? DESKey)[0..16]);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                var DCSP = Aes.Create();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                Byte[] inputByteArrays = new byte[inputByteArray.Length];
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch (Exception ex)
            {
                return ex.Message + decryptString;
            }

        }

    }
}
